Bug fixes for treetable

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10081 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Bug fix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10082 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Bug fix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10083 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
#6168

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10085 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
#6172

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10086 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
fixed NPE

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10087 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c